def calculate(num1, num2, operation):
    if operation == '+':
        return num1 + num2
    elif operation == '-':
        return num1 - num2
    elif operation == '*':
        return num1 * num2
    elif operation == '/':
        try:
            return num1 / num2
        except ZeroDivisionError:
            print("Eipä jaeta nollalla")
        else:
            return num1 / num2

operation = input("Valitse operaatio (+, -, *, /): ")
if operation != '+' and operation != '-' and operation != '*' and operation != '/':
    print("Operaatiota ei ole olemassa")
else:
    try:
        x = float(input("Anna luku 1: "))
        y = float(input("Anna luku 2: "))
    except ValueError:
        print("Ei tämä ole luku")
    else:
        print("Tulos:", calculate(x, y, operation))